Connected: An Internet Encyclopedia
RFC 1583 - 16.8. Equal-cost multipath

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### 16.8. Equal-cost multipath

The OSPF protocol maintains multiple equal-cost routes to all destinations. This can be seen in the steps used above to calculate the routing table, and in the definition of the routing table structure.

Each one of the multiple routes will be of the same type (intra-area, inter-area, type 1 external or type 2 external), cost, and will have the same associated area. However, each route specifies a separate next hop and Advertising router.

There is no requirement that a router running OSPF keep track of all possible equal-cost routes to a destination. An implementation may choose to keep only a fixed number of routes to any given destination. This does not affect any of the algorithms presented in this specification.

Next: 16.9. Building the non-zero-TOS portion of the routing table

Connected: An Internet Encyclopedia
RFC 1583 - 16.8. Equal-cost multipath